Journal
JOURNAL OF COMPARATIVE PSYCHOLOGY
Volume 120, Issue 1, Pages 31-37Publisher
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/0735-7036.120.1.31
Keywords
independent contrasts; social play; amygdala; hypothalamus
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The amygdala and hypothalamus become sexually differentiated by gonadal hormones giving rise to sexually differentiated behaviors, which include play behavior. Phylogenetic comparative analyses test for relationships between social play and brain structure volumes. Relative volume of the amygdala and hypothalamus correlated with social play, but not nonsocial play, even after controlling for the size of other brain structures. The authors propose that behaviors such as social assessment, recognizing and responding to facial expression, and social response appropriateness, which are mediated by the amygdala, are developed through social play. Additionally, the hypothalamus may regulate the motivation to engage in play through positive reinforcement of pleasurable activity. Thus, the instinctive socioemotive aspects of play in primates appear to be those regulated by the amygdala and hypothalamus.
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